Senator Patty Murray on August 25 became the 29th Senate Democrat to declare her support for the deal -- bringing the party within five votes of the 34 needed to uphold President Barack Obama's expected veto of a resolution rejecting the deal that Republican leaders are preparing to send him.

Senate Democratic Leader Harry Reid came close to declaring victory after appearing with Obama in his home state of Nevada.

"I felt cautiously optimistic that we would have enough votes to sustain the president's veto, and that seems pretty clear to me," Reid said.

NIAC Action Executive Director Jamal Abdi issued the following statement after Sen. Patty Murray (D-WA) announced that she will support the Iran nuclear deal:

"Sen. Patty Murray's endorsement of the Iran nuclear deal ensures that nearly the entire Senate Democratic Leadership is united behind the historic multilateral accord, with the exception of the hawkish Sen. Chuck Schumer (D-NY). Despite the tens of millions of dollars that have been poured into this debate by deal opponents, momentum continues to build toward Congress upholding the deal. Just five more Senators need to endorse the agreement to ensure that a forthcoming resolution of disapproval can be blocked.

"This deal is proving that it can stand on its own merits, but the battle is far from won. Opponents of the agreement are already looking to additional legislation that could complicate implementation and kill the deal. The more lawmakers that come out in support now, the stronger the firewall to protect the agreement in the future. It's time for other key Senators who have not announced their decision - including Sen. Maria Cantwell (D-WA) - to give peace a chance by publicly endorsing this deal."